Egypt's military rulers imposed an overnight curfew on Cairo's Tahrir Square and other parts of the capital, which is due to be lifted around now. It follows a violent eruption between Coptic Christians and security forces that have left at least 24 people dead. What began as a peaceful rally calling for justice over attacks on churches and radicalism, quickly turned into the most-violent episode since February's revolution. Military vehicles are clearly seen charging through crowds and ploughing into people, while army infantry fired rubber bullets and tear gas. Witnesses claim the escalation was sparked by unconnected trouble-makers, but state-owned media blames Christian protesters for instigating the violence. International relations expert Mark Almond says the unrest shows Egypt's secular status is under threat.
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